Does Cold Handgun Ammunition Shoot Slower than Warm?

Simple experiment, running some rounds through the chronograph that are freezing cold, vs rounds that are quite warm, and seeing if there is a difference in velocity. Rounds used: Winchester White Box and Winchester Service Grade 9mm, both 115 gr, Remington Green and White Box .45 Auto 230 gr, and Agula .380 ACP 95 gr FMJ.

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